Originally Posted by calpyro
I utilize a grant for maintaining the mash temps during the mash. I have 240Volt, 3500 Watt induction heater. It gravity feeds from the mash tun to the grant and I pump it back to the mash tun.
3500 Watt is good enough for small steps in temp and mash out. I also use it decoctions and boil-sanitizing hardware.
That's an interesting concept; using a grant when recirculating the wort. That may actually address one issue I have had with my 1.5" ss RIMS tube with a 3000W heater. I run it at 750W for maintaining temperature, but at 3000W for step mashes. My last two 10-gallon batches scorched during the step so I had to dump them. It scorched for just a few seconds, but the beer is utterly undrinkable!
Here's what happened. At the end of the 20 minute protein rest (122°F) the wort develops a foam layer in the mash tun (10g RM cooler w. false bottom). As I crank up the heat to step to 150°, that foam works its way down the grain bed and gets sucked out by the pump. As the foam builds up in the RIMS tube and pump, the pump is losing its prime so the flow almost stops. Bingo, scorched foam.
I could not believe that this is what happened the first time. I thought that there must have been an air leak at the MLT drain, so I took it apart, repacked it and tried a second batch. Scorch!
Up till now I have been returning the wort to the MLT through a silicone hose that floats on the surface. That could be part of the problem. If and when I attempt this again, I will try something different, and also back off on the power to, say 1500W, using the PID.
Has anyone run into this? Any ideas? Sorry I am a bit off topic here.